Underground comprehensive pipe gallery and laying construction method

The invention discloses an underground comprehensive pipe gallery. The underground comprehensive pipe gallery comprises a pipe gallery body; a notch is formed in the side wall of one side of the pipe gallery body, the notch extends to the two length ends of the pipe gallery body in the length direction of the pipe gallery body, and the notch penetrates into the pipe gallery body; and a plurality of steel bracket assemblies are uniformly arranged on the outer wall of the pipe gallery body at the notches in the length direction of the notches. The invention further discloses a laying construction method of the underground comprehensive pipe gallery. The notch extending in the length direction of the pipe gallery is formed in one side of the pipe gallery body, underground pipelines, including old pipelines, on the outer side of the pipe gallery can be arranged in the pipe gallery on the basis that the pipelines are not interrupted, and on the premise that the construction progress of the pipe gallery is guarante